 var requestAnimation = function() {
 var lastTime = 0
 var vendors = ['ms', 'moz', 'webkit', 'o']
 for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
  window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame']
  window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame']
 }
 
 if (!window.requestAnimationFrame)
  window.requestAnimationFrame = function(callback, element) {
   var currTime = new Date().getTime()
   var timeToCall = Math.max(0, 16 - (currTime - lastTime))
   var id = window.setTimeout(function() { callback(currTime + timeToCall); },
    timeToCall)
   lastTime = currTime + timeToCall
   return id
  }
 
 if (!window.cancelAnimationFrame)
  window.cancelAnimationFrame = function(id) {
   clearTimeout(id)
  }
}
export { requestAnimation }  